centered header text

Hi, thank you for fast replies and I am sorry that I have no idea about basic html coding.

How can I make the text centered in the photo please?: https://i.imgur.com/Wso0us2.jpg

it is centered from right to left but not centered from top to bottom.

these are the codes I use atm:

<h6>EAT, WALK, EXPLORE.</h6>
<h6>So much more than just a delicious food tour,<br>
it is your glimpse into Istanbul.</h6>
View Tours

css:

a.button,
a.button:visited,
button,
input[type="submit"] {
border-width: 1px;
border-style: solid;
border-color: inherit;
}

Thank you.